Skip to content

Modified version allows for scientific notation #1

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
mankind-nil wants to merge 2 commits into
base: master
Choose a base branch
from
Open

Modified version allows for scientific notation #1

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
3d8f334
Update ComplexNumber.java
mankind-nil Feb 1, 2023
8105e67
Update README.md
mankind-nil Feb 1, 2023
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
2 changes: 1 addition & 1 deletion README.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@ The features of this library include:
* Complex Specific Operations - Conjugate, Inverse, Absolute/Magnitude, Argument/Phase
* Trigonometric Operations - sin, cos, tan, cot, sec, cosec
* Mathematical Functions - exp, square, sqrt
* **Complex Parsing** of type x+yi
* **Complex Parsing** of type x+yi, in standard or scientific notation


### Example Usage
Expand Down
104 changes: 69 additions & 35 deletions com/abdulfatir/jcomplexnumber/ComplexNumber.java
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -11,14 +11,19 @@
* <li>Arithmetic Operations (addition, subtraction, multiplication, division)</li>
* <li>Complex Specific Operations - Conjugate, Inverse, Absolute/Magnitude, Argument/Phase</li>
* <li>Trigonometric Operations - sin, cos, tan, cot, sec, cosec</li>
* <li>Mathematical Functions - exp</li>
* <li>Complex Parsing of type x+yi</li>
* <li>Mathematical Functions - exp, square, sqrt</li>
* <li>Complex Parsing of type x+yi, in standard or scientific notation</li>
* </ul>
*
* @author Abdul Fatir
* @version 1.2
* @version 1.3
*
*/

import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.ArrayList;

public class ComplexNumber
{
/**
Expand Down Expand Up @@ -334,40 +339,69 @@ public double getArg()
public static ComplexNumber parseComplex(String s)
{
s = s.replaceAll(" ","");
s = s.replaceAll("E","e");
s = s.replaceAll("I","i");
ComplexNumber parsed = null;
if(s.contains(String.valueOf("+")) || (s.contains(String.valueOf("-")) && s.lastIndexOf('-') > 0))
{
String re = "";
String im = "";
s = s.replaceAll("i","");
s = s.replaceAll("I","");
if(s.indexOf('+') > 0)
{
re = s.substring(0,s.indexOf('+'));
im = s.substring(s.indexOf('+')+1,s.length());
parsed = new ComplexNumber(Double.parseDouble(re),Double.parseDouble(im));
}
else if(s.lastIndexOf('-') > 0)
{
re = s.substring(0,s.lastIndexOf('-'));
im = s.substring(s.lastIndexOf('-')+1,s.length());
parsed = new ComplexNumber(Double.parseDouble(re),-Double.parseDouble(im));
}

//first determine if either of the numbers might be in scientific notation
ArrayList<String> allMatches = new ArrayList<String>();
Matcher m = Pattern.compile("[+-]?[0-9.]+e[+-]?[0-9]+").matcher(s);
while (m.find()) {
allMatches.add(m.group());
}
else
{
// Pure imaginary number
if(s.endsWith("i") || s.endsWith("I"))
{
s = s.replaceAll("i","");
s = s.replaceAll("I","");
parsed = new ComplexNumber(0, Double.parseDouble(s));
}
// Pure real number
else
{
parsed = new ComplexNumber(Double.parseDouble(s),0);
}

String re;
String im;

switch(allMatches.size()){
case 2: //both numbers are scientific notation
re=allMatches.get(0);
im=allMatches.get(1);
parsed = new ComplexNumber(Double.parseDouble(re),Double.parseDouble(im));
break;
case 1: //one number has scientific notation
String[] s2=s.split(allMatches.get(0).replaceAll("\\+","\\\\+"));//replacement required because the match pattern could be something like "+1.234e-06" and the "+" needs to be escaped for Regex to work
if(s.matches(".*" + allMatches.get(0).replaceAll("\\+","\\\\+") + "i" )){//the scientific number must be imaginary
im=allMatches.get(0);
re=s2[0].isEmpty()?"0":s2[0];//if there is no real number, set it to zero
}else{ //the scientific number must be real
re=allMatches.get(0);
if(!(s2.length==0)){
im=s2[1];
im = im.replaceAll("i",""); //replace any trailing i values
}else{//there is no imaginary component, so set it to zero
im="0";
}
}
parsed = new ComplexNumber(Double.parseDouble(re),Double.parseDouble(im));
break;
case 0: //no scientific notation, use the original method
if( (s.contains(String.valueOf("+")) && s.lastIndexOf('+') > 0) || (s.contains(String.valueOf("-")) && s.lastIndexOf('-') > 0)){ //has a real and imaginary part
s = s.replaceAll("i","");
if(s.lastIndexOf('+') > 0)
{
re = s.substring(0,s.lastIndexOf('+'));
im = s.substring(s.lastIndexOf('+')+1,s.length());
parsed = new ComplexNumber(Double.parseDouble(re),Double.parseDouble(im));
}
else if(s.lastIndexOf('-') > 0)
{
re = s.substring(0,s.lastIndexOf('-'));
im = s.substring(s.lastIndexOf('-')+1,s.length());
parsed = new ComplexNumber(Double.parseDouble(re),-Double.parseDouble(im));
}
}else{
if(s.endsWith("i"))// Pure imaginary number
{
s = s.replaceAll("i","");
parsed = new ComplexNumber(0, Double.parseDouble(s));
}
else // Pure real number
{
parsed = new ComplexNumber(Double.parseDouble(s),0);
}
}
break;
}
return parsed;
}
Expand Down